A brief introduction to infinityAlasdair Wilkins6/08/11 7:40pmFiled to: Extreme mathsInfinityAleph-oneAleph-nullSet theoryGeorg CantorSetOne-to-one correspondencemathematicsMathNatural numbersRational numbersreal numbersScienceTopMaths1554EditPromoteShare to KinjaToggle Conversation toolsGo to permalink The notion of infinity is fundamentally beyond the human ability to comprehend, but that hasn't stopped mathematicians from trying. So just what is infinity, and why is there more than one of them? And just what is infinity plus one?Last week, we searched for the largest meaningful number in the universe, but all of these must of course pale in comparison to infinity. Mathematicians define "infinity" very strictly. But we'll stick with a broader, everyday definition: Infinity covers any number that isn't finite. Now, without further ado, let's expand our minds and tiptoe towards infinity.